Photon energies, x-ray

Matscheko and Ribberfors, A Compton scattering spectrometer for determining X-ray photon energy spectra. Phys. Med. Biol., 1987. 32(5) p. 577-594. 

Figure 7 shows the absorption efficiency of the BaFBr calculated as a function of the X-ray photon energy. The absorption efficiency is 96% for 17keV X-rays when the phosphor is 150 pm thick. The absorption edge at 37.4 keV is due to barium. The quantum efficiency of integrating detectors, however, can not be determined by the absorption efficiency alone, because the noise level of the system causes the quantum efficiency of these detectors to deteriorate. In Fig. 8, the relative uncertainty... 

Figure 14.8 Relative energy positions of the maxima of the main D2 peaks in the resonant KL23L23 Auger spectra of Cu and Ni metals as a function of the exciting X-ray photon energy related to the K-absorption threshold [25]. The linear dispersion and constant regions are indicated by the solid lines.

Fig. 11.13. Cd 3d X-ray photoemission spectra for buik, 4.5 nn and 2.2 nm CdS nanocrystais recorded with an X-ray photon energy of 1486.6 eV (Ai-Ka). Adapted from [99].

The electron-hole pairs, as the electric charge, are swept from the detector diode. A preamplifier collects the charge to produce an output of electrical pulse whose voltage amplitude is proportional to the X-ray photon energy. The energy resolution of the detector (R) in eV can be estimated. 

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